As a linguistic expert with a deep understanding of both English and Chinese, I am well-equipped to dissect and explain the nuances of language, including idiomatic expressions and slang. The phrase "I am down" is a versatile expression that can have different meanings depending on the context in which it is used.

In contemporary English, particularly in informal and colloquial speech, "I am down" or "I'm down" is often used to indicate agreement, acceptance, or enthusiasm about a proposal or idea. It can be akin to saying "I'm in" or "I agree." For instance, if someone invites you to an event and you respond with "I'm down," it means you are interested and willing to participate.

However, the phrase can also convey a sense of being in a low mood or feeling downcast. In this context, saying "I am down" might mean that you are sad, upset, or not feeling your best. It's a way to express your emotional state without going into detail about the reasons behind your feelings.

The example provided, "I'm down with science," seems to be a bit of a misinterpretation of the phrase. While it could theoretically mean that someone is knowledgeable about or agrees with the principles of science, it's not a common way to express such a sentiment. The phrase is more typically used in the context of social agreements or emotional states, rather than to express familiarity with a subject matter.

It's also worth noting that slang phrases like "I am down" can vary greatly in their usage and acceptance across different regions and social groups. What might be understood in one community could be confusing or even unknown in another. Therefore, it's important to be aware of the context and the audience when using such expressions.

**read more >>

vote 11. If you are down with something it means that you have knowledge of something or are in agreement with it. I'm down with science means "I am familiar with science" or "science is a good thing." To be down with something is a slang phrase, and not terribly common in formal speech or writing.read more >>